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KVM: arm/arm64: vgic-its: Check CBASER/BASER validity before enabling the ITS

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The spec says it is UNPREDICTABLE to enable the ITS
if any of the following conditions are true:

- GITS_CBASER.Valid == 0.
- GITS_BASER<n>.Valid == 0, for any GITS_BASER<n> register
  where the Type field indicates Device.
- GITS_BASER<n>.Valid == 0, for any GITS_BASER<n> register
  where the Type field indicates Interrupt Collection and
  GITS_TYPER.HCC == 0.

In that case, let's keep the ITS disabled.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2017-10-26 17:23:05 +02:00 committed by Christoffer Dall
parent f31b98b57f
commit c9b51bb60d
1 changed files with 11 additions and 0 deletions
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11
virt/kvm/arm/vgic/vgic-its.c
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@ -1466,6 +1466,16 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
{
mutex_lock(&its->cmd_lock);
/*
* It is UNPREDICTABLE to enable the ITS if any of the CBASER or
* device/collection BASER are invalid
*/
if (!its->enabled && (val & GITS_CTLR_ENABLE) &&
(!(its->baser_device_table & GITS_BASER_VALID) ||
!(its->baser_coll_table & GITS_BASER_VALID) ||
!(its->cbaser & GITS_CBASER_VALID)))
goto out;
its->enabled = !!(val & GITS_CTLR_ENABLE);
/*
@ -1474,6 +1484,7 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
*/
vgic_its_process_commands(kvm, its);
out:
mutex_unlock(&its->cmd_lock);
}